Givi BF73 Tank Flange Ring for Harley-Davidson Sportster S 1250 21-23Specific Flange to be used with Givi " Tanklock" Tank Bags only. Warning: this product contains only the metal parts that should be fixed to the tank together with the plastic flange that is already mounted to the Tanklock bag and sold together with the bag or sold separately as a spare. The plastic flange is not included because it is not needed, it must be removed from the bag and fixed on the tank using the parts included in this kit. It often